I've got one too.
One of my sister's friends dated her boyfriend for a little over 4 years. I don't have the details as to why they broke up, but they did. They tried to remain friends, but after 2 months they both agreed that that would just complicate things. They went into NC and started dating other people. All together, they were apart for 3 years. I'm still not sure who initiated the contact, but when they finally began talking again - the girl describes - it was like they were meeting each other again for the first time. They have been back together for over a year and are now planning their wedding.